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对等点播系统中节点搜索机制研究
  • 摘要

    对等点播系统(P2P-VoD)中的跳转操作需要高效的节点搜索,如何快速查找到“合适”的节点是个挑战.“合适”包含两方面因素:(1)内容匹配;(2)物理性能匹配.而传统的方法大部分只涉及对前者的研究.文中提出了一种层次化的搜索模型(简称Mediacoop),不仅可以让搜索到的节点在内容上满足要求,而且在物理性能上也能满足要求.具体而言,Mediacoop首先利用播放距离来索引全部节点,再利用延迟特征优选内容上已经符合要求的节点.在NS2模拟器上的实验表明,Mediacoop在用户体验和系统开销上均优于传统的方法.同时,在实际系统CoolFish中的部署和运行也验证了Mediacoop的实用性.

  • 作者

    张铁赢  刘悦  钟运琴  程学旗  ZHANG Tie-Ying  LIU Yue  ZHONG Yun-Qin  CHENG Xue-Qi 

  • 作者单位

    中国科学院计算技术研究所 北京100190/中国科学院研究生院 北京100190/中国科学院计算技术研究所 北京100190;中国科学院研究生院 北京100190

  • 刊期

    2012年7期 ISTIC EI PKU

  • 关键词

    对等  视频点播  节点搜索  流媒体 

参考文献
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